There are much better games for PvE looting, honestly. My recommendation is the STALKER: Anomaly modpacks like EFP and GAMMA, both of which are free downloads.

Trying to make ARC Raiders into a PvE shooter would require every map and enemy to get reworked for low-population gameplay. The game just isn't built for it, and their effort is better invested in catering to the preexisting playerbase.